LG MDD64K Service Manual page 17

2. P-SENS
P-SENS
YES
Check
NO
the pin6 of P9702
if DC V is over
5.6V
YES
OK
4. MICOM PART CHECK I
MICOM PART
CHECK I
YES
NO
Check P-SENS
(P7904_pin6)
YES
Check both
NO
end voltage of
IC101
(KIA7042)
YES
Check voltage of
IC100(LC87Fxxx) pin4
YES
OK
Check power circuit
troubleshooting
Refer to SMPS
troubleshooting
Check
NO
If input voltage of
IC101 is over
5V
YES
Check if IC101 of out-
put voltage is over 4.3V
YES
OK
3-2
3. VKK PART CHECK
VKK CHECK
YES
Check
the pin3 of P9702
if DC V is over
-28V
YES
OK
Check the
periphery of IC101
(KIA7042)
NO
Check power circuit
troubleshooting
NO
Replace IC101
(KIA7042)